Sewing-machine



v (N0 Model.)

au W. F. WEBSTER.

Sewing Machine.

Patented Jan. 25,1881'.

52% W, Wg

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` NJETEH. PNQTO-LITMAPNEI, WAIHINGTON. D. C.

UNITED STATES PATENT OFFICE.

JOHN F. WEBSTER AND WILLIAM F. WEBSTER, OF SPRINGFIELD, OHIO.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 237,070, dated January 25, 1881. Application filed April 26, 1880. (No model.)

To all lwhom it may concern:

Be it known that we, J onN FRASER WEB- STER and WILLIAM FRASER WEBSTER, both of Springfield, Clarke' county, Ohio, have invented certain new and useful Improvements in Sewing-Machines, of which the ollowingis a specification.

This invention relates to those sewing-machines in which a spherical eccentric is employed for communicating motion from a horizontal main shaft to a vertical counter-shaft, which latter operates the shuttle and feed-levers; and our improvement comprises the following speciic combination of devices, to wit: a ball-eccentric, two concave sliding boxes, and a fork having straight or parallel jaws. Of these devices the ball-eccentric is keyed fast to the Ina-in shaft and carries the two sliding or reciprocatih'g boxes, the inner faces ot' which are concave, while their outer faces are straight,in order that said boxes may play vertically within the vibrating fork, which fork is attached to the upper end of the counter-shaft, as hereinafter more fully described, and pointed out in the claim.

In the annexed drawings, Figure l is a partially sectionized elevation ot' a sewing machine embodying our invention. Fig. 2 isva vertical section of the yoke and the ball-eccentric, taken transversely of the main shaft of the machine, one ofthe sliding boxes being shown in elevation and the other one in section. Fig. 3 is a vertical section of said yoke and-ball-eccentric, taken in the plane of the main shaft, and Fig. 4 represents, by front elevation and vertical section, one of a pair of dished washers that may be employed with the ball-eccentric.A

A represents the bed-plate, and B the arm, ot any approved form ot' sewing-machine, said arm having journaled in it the main horizontal shaft O, which shaft may be driven by a band passing around the pulley c, or otherwise. Keyed fast to this driving-shaft is an eccentric, D, having a convex or crowning periphery, and carrying two boxes or bearings, E E', that are adapted to reciprocate vertically within the fork Fof an arm, f, which arm is rigidly secured to the upper end of a perpendicular rock-shaft, G. This shaft vibrates in bearings h h of the column or standard H that supports the arm B, and has attached to its lower end the shuttle-lever I. Furthermore, this rock-shaft Gis arranged to operate any suitable form of feedflever devices J.

U represents one of a pair of dished washers, that may be substituted for the boxes E E' of the eccentric D.

It is evident the rotation of eccentric D will impart the desired rocking motion to fork F and shaft G, and in case either of the shafts O or G should get out of line the spherical or crowning shape of said eccentric would compensate for such a defect and allow the boxes E E to play as accurately as though said shafts were exactly at right angles to each other or, in other words, the spherical eccentric acts as a universal joint for the transmission of motion at this vital part of the sewingmachine, while its boxes E E allow any lost motion to be taken up.

kWe are aware it is not new to employ a ball-eccentric, strap, and connecting-plate for communicating motion from the horizontal driving-shaft of a sewing-machine to a vertical counter-shaft of the same, as this construe tion is seen in Letters Patent No. 117,797, issued August 8, 1871, to N. Meyers.

We are also aware it is not new to apply a ball-eccentric to the feed-lever ot' a sewingmachine for the purpose of causing said eccentric to operate the shuttle-lever by revolving between a pair of wings attached to the heel ot' said shuttle-lever, as this combination of devices is seen in Letters Patent No. 80,345, issued July 28, 1868, to S. French. Such being the state of the art, our claim is not designed to be construed broadly, but is expressi y limited to the within-described specific combination of horizontal drivin g-shaft, spherical eccentric, concave sliding boxes, straightfaced fork, and vertical countershaft.

We claim as our invention- The combination, in a sewing-machine, with the horizontal driving-shaft C and shuttle-lever I, of the spherical eccentric D,'boxes E E', and vertical counter-shaft G, provided with the fork F-f, said boxes E E' being concave where they lit over the Spherical eccentric, and having straight outer faces that play vertically within the jaws of said fork, as herein described.

In testimony of which invention we hereunto set our hands.

JOHN FRASER WEBSTER. WILLIAM FRASER WEBSTER.

Witnesses:

C. F. YEKEY, GEORGE J oHNsoN,

IOO 

